1. an excessively or blindly optimistic person.
2. (often lowercase). Also, Pollyannaish. unreasonably or illogically optimistic: some pollyanna notions about world peace.
See more synonyms on Thesaurus.com
Origin: from the name of the child heroine created by Eleanor Porter (1868-1920), American writer
Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.